[llvm-bugs] [Bug 47686] New: Implement -march=x86-64-v2, -march=x86-64-v3, -march=x86-64-v4 for x86-64

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=47686

            Bug ID: 47686
           Summary: Implement -march=x86-64-v2, -march=x86-64-v3,
                    -march=x86-64-v4 for x86-64
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Backend: X86
          Assignee: unassignedbugs at nondot.org
          Reporter: fweimer at redhat.com
                CC: craig.topper at gmail.com, llvm-bugs at lists.llvm.org,
                    llvm-dev at redking.me.uk, spatel+llvm at rotateright.com

x86-64-v2, x86-64-v3, x86-64-v4 have been added to the psABI as new
micro-architecture levels:

https://gitlab.com/x86-psABIs/x86-64-ABI/-/commit/77566eb03bc6a326811cb7e9a6b9396884b67c7c

Clang should provide -march= options so that programmers can easily built
programs and shared objects that are optimized for these levels.

It would be nice to implement this at the LLVM level, so that multiple front
ends could use this functionality and achieve consistency (not just Clang).

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